Tripod for rock-drills



(No Model.)

G. M. GITHENS. i TRIPOD FOR ROCK DRILLS; No. 307,640. Patented Nova 4,1884.

Orrrc "illii l GEORGE M. GITHENS, OF BROOKLYN, NEV YORK.

TRIPOD FOR ROCK-DRILLS.

SPECIFICATION forming part. of Letters Patent No. 307,640, datedNovember 4, 1884.

Application filed February 18, 1884. (No model.)

To aZZ whom, it may concern:

Be it known that I, GEORGE M. Grrnnns, of Brooklyn, in the county ofKings and State of New York, have invented an Improvement in Tripods forRock-Drills, of which the following is a specification.

This invention is made for giving greater facilities than heretofore formoving the logs into diflorent positions and securing the same in themost firm and rigid manner, so that the rock-drill cylinder held therebycan be placed in any desired position in relation to such tripod.

In the drawings, Figure l is an elevation, partly in section, of thetripod and hub. Fig. 2 is a plan of the joints at the upper ends of thetripod. Fig. 3 is a side view, partially in section, of the same; andFig. i is a sectional side elevation of the tripod and hub of the steamrock-drill in smaller size.

The two front legs, A B, and the rear leg, 0, are each made as atube,with an extensioirrod, d, therein that may be set at any desired lengthand clamped by the bolt 0 in the band f, and usually there are movableweights that can be placed upon the legs to keep the instrument frommoving under the reciprocation of the drill. These parts are of ordinarycharacter, except that the upper end ofeach tube is forged solid with abolt or bar inserted into the tube, the exterior being tapering orconical, and provided with a screw and nut at the end, and each socketis tapering, so that the end of the tubular leg fits firmly therein, andthe concussion will not produce any looseness of the leg in its socket,as the parts wedge tightly together and the nut is set up from time totime. i

The cylinder of the steam rock-drill is provided with a cylindrical hub,12, around the pe riphery of which is a groove, and the split band H isadapted to fit around this hub o. The bolt h,that is used to clamp thissplit band to the hub, is passed across so as to enter this groove atone side,thereby preventing the ring separating from the hub, butallowing the hub to be turned around in the ring H.

At the sides of the split band H there are the hubs 71, with circularconical recesses for the reception of similar-shaped projections k uponthe link-pieces It.

through these link-pieces, and by screwing the The bolt h passes same upthe link-pieces it are clamped in the faces of the links k, so as tomake a very firnr connection for the back leg when the bolt m istightened up. Each link It: is provided with a cylindrical projection ortrunnion at one side, around the bolt 71, and this is groovedperipherally. The socketso and 0 of the front legs are provided withsplit bands 1) p, adapted to fit around the respective trunnions, theclamp-screws r r of the respective split bands pass at one side into theperipheral groove, so as to prevent the parts separating, and bytightening such bolts after the respective legs have been moved to theirplaces the splitbands will clamp the trunnions in the mostfirm andreliable manner.

I do not claim either of the separate parts, as I am aware that a splitband with abolt has been applied to a screw-head grooved circun1-i'erentially, and I am aware that wooden legs have been tapered and madewith a screw at the end, and that tubular legs have been used. By myimprovement the clamping-screw is made to hold the clamp upon thetrunnion, to clamp the trunnion, and to clamp the links Isimultaneously.

I claim as my invention 1. The con'ibination, with the hub or trunnionwith aperipheral groove for supporting the rock-drill, of a split band,aclamping-bolt passing across at the open portion of such split band andinto the peripheral groove of the trunnion, and links through which suchbolt passes, and the legs and connecting-pieces between the legs and therespective links and bolts, substantially as set forth.

2. The combination, with the split ring H and the bolt h, of the links75 k, through which the bolt it passes, the leg 0, connected to suchlinks, the trunnions upon such links,the sockets 0 0, the legs A B,fitting such sockets, the

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split rings 1) p, and the bolts 1 1-, substantially I in combinationwith aspl it band and a clampzts set forth. ing-bolt passing through thesplit bend and 3. The tubular metallic tripod-legs, eachintotheperipherztlgroove,forholding-the split 15 closed atits upper endand made conical, and band to the trunnion,theli11ks,the connections 5terminating with a screw and nut, in combinabetween the legs and links,and the bolts for tion with the conical metallic sockets throughclamping the some, substantially as set forth. which the closed portionsof the legs pass, and Signed by me this 13th day of February, A. areheld by the nuts, and the connections bel D. 1884.

tween the sockets, substantially as set forth. I GEO. M. GITHENS. IO 4.The trunnion having aperipheral groove Vitnesses: I

and forming a support for the rock-drill and GEo. T. PINOKNEY, itsconnected parts, and the legs for such drill, I WILLIAM G.- MoTT.

